Accession Number : AD0769493

Title :   Wind Tunnel Test of a Double-slotted Rudder.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s) : Fister,Bruce L.

Report Date : MAR 1973

Pagination or Media Count : 154

Abstract : A double-slotted rudder (DSR) proposed for an advanced medium STOL transport (AMST) was tested against the same rudder with the slots closed. Multi-element airfoil theory and its application to a DSR was reviewed. Various design criteria for slotted airfoils were discussed. The tests were performed in a 7 X 10 foot wind tunnel at a dynamic pressure of 17.0 psf and a nominal Reynolds number of 2,000,000. The rudder was tested in 10 degree increments of deflection up to a maximum of 40 degrees, and at sidewash angles varying from -10 to +10 degrees. The DSR showed a 60% increase in side force over the plain double-hinged rudder which was the next best performing rudder configuration. The side force versus sidewash angle curve was linear. A rudder deflection schedule was devised which produces nearly linear side forces and minimum drag. The L/D polar of the DSR was significantly better than those of other configurations. No adverse aerodynamic properties were observed that would preclude the use of a DSR on an AMST. (Author)

Descriptors :   (*Aerial rudders, Wind tunnel tests), (*Short takeoff aircraft, Aerial rudders), Aerodynamic control surfaces, Slotted flaps, Airfoils, Aerodynamic drag, Wind tunnel models, Theses

Subject Categories : Aerodynamics
      V/STOL

Distribution Statement : APPROVED FOR PUBLIC RELEASE